飞机在飞行轨迹的最高点，是什么时候，此时距离出发点，也就是关闭引擎的时刻，高度相差多少？，什么时候开始自由落体？
When is the plane at its highest point of its trajectory and how high is it above the point where it started when it turned the engines off when it went into free fall?
在二十世纪50年代，当福特汽车公司几乎就要开始大规模生产一款能飞行的汽车的时候，人们对之的热情达到了最高点。
Enthusiasm for flying cars reached a peak in the 1950s when the Ford Motor Company almost started mass-producing one.
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